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<A HREF="iscntrl.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="isgraph.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Rogue Wave C++ Standard Library Reference Guide</B></DIV>
<H2>isdigit()</H2>
<P><B>Module:</B>&nbsp;&nbsp;Standard C++ Library&nbsp;&nbsp;&nbsp;<B>Library:</B>&nbsp;&nbsp;<A HREF="2-6.html">Localization</A></P>

<PRE><HR><B><I>Function</I></B><HR></PRE>

<UL>
<LI><A HREF="#sec1">Local Index</A></LI>
<LI><A HREF="#sec2">Summary</A></LI>
<LI><A HREF="#sec3">Synopsis</A></LI>
<LI><A HREF="#sec4">Description</A></LI>
<LI><A HREF="#sec5">See Also</A></LI>
<LI><A HREF="#sec6">Standards Conformance</A></LI>
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<A NAME="sec1"><H3>Local Index</H3></A>
No Entries
<A NAME="sec2"><H3>Summary</H3></A>
<P>Locale convenience function that determines if a character is a decimal digit</P>
<A NAME="sec3"><H3>Synopsis</H3></A>

<PRE>#include &lt;locale&gt;

namespace std {
  template &lt;class charT&gt; 
  bool isdigit(charT c, const locale&amp; loc);
}
</PRE>
<A NAME="sec4"><H3>Description</H3></A>
<P>The <SAMP>isdigit()</SAMP> function returns <SAMP>true</SAMP> if the character passed as a parameter is a decimal digit. Otherwise, the function returns <SAMP>false</SAMP>. The check is made using the <SAMP>ctype</SAMP> facet from the <SAMP>locale</SAMP> parameter.</P>
<A NAME="sec5"><H3>See Also</H3></A>
<P><B><I><A HREF="ctype.html">ctype</A></I></B>, <B><I><A HREF="locale.html">locale</A></I></B>, <SAMP><A HREF="isalnum.html">isalnum()</A></SAMP>, <SAMP><A HREF="isalpha.html">isalpha()</A></SAMP>, <SAMP><A HREF="iscntrl.html">iscntrl()</A></SAMP>, <SAMP><A HREF="isgraph.html">isgraph()</A></SAMP>, <SAMP><A HREF="islower.html">islower()</A></SAMP>, <SAMP><A HREF="isprint.html">isprint()</A></SAMP>, <SAMP><A HREF="ispunct.html">ispunct()</A></SAMP>, <SAMP><A HREF="isspace.html">isspace()</A></SAMP>, <SAMP><A HREF="isupper.html">isupper()</A></SAMP>, <SAMP><A HREF="isxdigit.html">isxdigit()</A></SAMP></P>
<A NAME="sec6"><H3>Standards Conformance</H3></A>
<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 22.1.3.1</I></P>

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